I am getting stronger and stronger in the world of demons and monsters

Traveling back in time to the last years of the dynasty when demons and warriors were common, Lin Xuankong, who was poor and sick, discovered that he had the fate of "old and strong". The longer he lived, the stronger his talent and understanding would be. At the age of fifty, the speed of cultivation will increase fifty times, at the age of eighty, it will increase eighty times, and at the age of three hundred, it will increase three hundred times... Lin Xuankong suddenly looked back. The countless powerful enemies he had killed had turned into bones and vanished into thin air. The willow tree he had inspired with his own hands had become the master of billions of demons! From now on, the bright moon in the boat will go away, and the eternal life will be a lonely person. ...